diff --git a/owlps-positioning/src/userinterface.cc b/owlps-positioning/src/userinterface.cc
index a0c59f7..7198378 100644
--- a/owlps-positioning/src/userinterface.cc
+++ b/owlps-positioning/src/userinterface.cc
@@ -81,41 +81,88 @@ void UserInterface::fill_cli_options()
 
 void UserInterface::fill_file_options()
 {
-  file_options->add_options()
+  fill_server_options() ;
+  fill_input_options() ;
+  fill_log_options() ;
+  fill_positioning_options() ;
+  fill_output_options() ;
+}
 
-  // Server options
+
+void UserInterface::fill_server_options()
+{
+  po::options_description options("Server options") ;
+
+  options.add_options()
   ("server.port,l", po::value<int>()
    ->default_value(DEFAULT_LISTENING_PORT),
    "Server listening port.")
+  ;
 
-  // Input options
+  file_options->add(options) ;
+}
+
+
+void UserInterface::fill_input_options()
+{
+  po::options_description options("Input options") ;
+
+  options.add_options()
   ("input.medium,I", po::value<string>(),
    "Medium from which requests are read. Allowed: CSV.")
   ("input.csv-file,C", po::value<string>(),
    "CSV file to use for input (when input.medium = CSV).")
+  ;
 
-  // Log options
+  file_options->add(options) ;
+}
+
+
+void UserInterface::fill_log_options()
+{
+  po::options_description options("Log options") ;
+
+  options.add_options()
   ("log.medium,L", po::value< vector<string> >()->composing(),
    "Medium to which the requests will be logged. You can specify \
 this option more than once. Allowed: none, CSV. The `none` value \
 completely disables logging.")
   ("log.csv-file", po::value<string>(),
    "CSV file to use for logging (when log.medium = CSV).")
+  ;
 
-  // Positioning algorithm options
+  file_options->add(options) ;
+}
+
+
+void UserInterface::fill_positioning_options()
+{
+  po::options_description options("Positioning options") ;
+
+  options.add_options()
   ("positioning.algorithm,A", po::value< vector<string> >()->composing(),
    "Algorithms used to compute positions. You can specify \
 this option more than once (but at least once). Allowed: Real.")
+  ;
 
-  // Output options
+  file_options->add(options) ;
+}
+
+
+void UserInterface::fill_output_options()
+{
+  po::options_description options("Output options") ;
+
+  options.add_options()
   ("output.medium,O", po::value< vector<string> >()->composing(),
    "Medium to which the results will be wrote. You can specify \
 this option more than once. Allowed: Terminal, CSV. \
 If this option is absent, results will be printed on the terminal.")
   ("output.csv-file", po::value<string>(),
    "CSV file to use for output (when output.medium = CSV).")
+  ;
 
-  ; // End of options
+  file_options->add(options) ;
 }
 
 
diff --git a/owlps-positioning/src/userinterface.hh b/owlps-positioning/src/userinterface.hh
index f0a0c31..362be88 100644
--- a/owlps-positioning/src/userinterface.hh
+++ b/owlps-positioning/src/userinterface.hh
@@ -17,15 +17,24 @@ protected:
   //@{
   /// Fill in all the options
   void fill_options(void) ;
+
   /// Fill in the options accepted on the command line
   void fill_cli_options(void) ;
+
   /// \brief Fill in the options accepted on the command line and in
   /// the configuration file
   void fill_file_options(void) ;
+  void fill_server_options(void) ;
+  void fill_input_options(void) ;
+  void fill_log_options(void) ;
+  void fill_positioning_options(void) ;
+  void fill_output_options(void) ;
+
   /// Parse all the configuration inputs and updates Configuration
   void parse_options(void) ;
   void parse_command_line(void) const ;
   void parse_file(void) const ;
+
   /// If help was requested by user, displays accepted options and exit
   void print_usage_and_exit_if_requested(void) const ;
   //@}